Luna from HP, Piper from PJ, and Wanda Maximoff from MCU. Oh yeah, SPOILER ALERT FOR INFINITY WAR
1. Luna is a great character with a bad history. Her mother died when she(she being Luna) was 9, and unlike Harry, Luna could remember her. Luna has always been a bit of an outcast and called weird, but she used this to her advantage and just ignored everybody. She was insulted and called "Loony" because of her odd beliefs, and only a few people saw beyond the odd things she said. Beyond that, Luna was clever, brave, encouraging, and kind. She helped Harry produce a Patronus at the Battle of Hogwarts when no one else could and helped him find a Horcrux.
2. Piper is a bit of an underrated character in the series. Most people like Annabeth the best, and don't get me wrong, I do like Annabeth but I like Piper a bit more. The reason hy is because not only was she cast out for being different like Luna, she never really got to do much. True, Annabeth did have a hard childhood being on the run and all, but Piper had a father who was almost never around, her powers in which nobody believed her, and the fact that every time she thought something happy happened it was all the Mist. She's brave, beautiful, and clever, and showed the Aphrodite cabin what love and beauty really is.
3. Wanda, Wanda, Wanda. She is one of my all-time favorites in the MCU. That's because she's basically a queen. Wanda had a bad past with HYDRA experimenting on her and Pietro. Though they did allow it, it was because they had almost no choice. They were orphaned at age 10 and had to take care of themselves. After she joined the Avengers and slowly became happy, her twin Pietro died protecting Hawkeye. After recovering, she finally found love with Vision, the android that the Avengers created(HERE COMES THE SPOILER). Then, Wanda is forced to kill Vision to destroy the Infinity Stone of Mind and not let Thanos get it. She literally destroys THE MOST powerful Infinity stone with one hand while holding off THANOS who has five Infinity stones with the other? Can I get a "GO QUEEN"? Then, she has to stand there and watch as Thanos just turns back time anyways, killing Vision practically again and getting the stone. And Wanda doesn't go insane(ANOTHER BIG SPOILER AHEAD)? Unfortunately, she turns to ash because of the Snap and yeah.
Shoutout to Bucky Barnes, who I also love.